Casey had her back turned to the bedroom door, but when Olivia got home, she was still awake. She heard the door open, she felt the bed adjust as another body joined it. As Olivia moved to put her arms around her, Casey moved away. "Don't touch me," she said quietly.

"Are you okay? Is this because I had to go into work?"

"Work?" Casey repeated. "That's really funny, Olivia, because your partner called me after you left and he was lost when I told him you were on your way. And then he asked me to come down to the precinct, and what do you think he did then?"

Olivia sat up. "What did he tell you?"

"The truth." Casey got out of bed and made her way to the window seat. Sitting down, she curled up, still refusing to look at Olivia. She was too hurt by her wife's betrayal. She grabbed the envelope containing the pictures and tossed it across the room, where it landed next to Olivia. "I would say look inside, but you already know what's inside."

Olivia opened the envelope and sighed. "Casey-"

Casey interrupted her. "How long has this been going on? Those pictures are recent, but something tells me it's been going on a lot longer than that. So tell me, Olivia. Tell me the truth for once. How long have you and Alex Cabot been sleeping together behind my back?"

"I-" Olivia looked down at the pictures, and Casey knew she was debating how to answer her. "A couple of months," she said finally.

"Months?" Casey repeated. "You've been cheating for months." It wasn't a question; it was a statement. One that made it feel, to Casey, like the world had just crashed around her, shattering on impact with reality. "You've been cheating for months," she said again. "Well, I'm glad I could fill your bed until she got back." By now, Casey's tears were falling freely and her voice was cracking in several places.

"Casey, it's not like that." Olivia looked at her. "I'm not going to make any excuses, but please believe that I do love you. I love you more than anything."

Casey shook her head, turning away once more. "I've been faithful to you since day one," she said quietly. "I thought…I thought our marriage was strong. I thought it was built on trust, and honesty, and loyalty. And now all of those things just jumped out the window." She wiped her tears away just as a fresh set began to fall. "Why, Olivia? Why wasn't I good enough?"

"You are. Casey, I know I can't explain this away, no matter how much I want to. Is it possible for you to forgive me? It will never happen again. Can you forgive me?"

"I don't know." Casey looked out the window, focusing her attention on a light in the distance. "You acted like everything was perfect, like I was your only one, and in the meantime, you were occupying two beds at once."

"I know I messed up. It won't happen again. Please believe that I really love you, Case."

Casey fought back more tears. Her heart felt like someone had crushed it, then tap danced on it. "Olivia," she said, turning around to face the brunette. "I can't deny that I love you. But I also can't deny my broken heart, and it's going to take a lot more than sorry to fix this. You betrayed me, you betrayed our marriage. In time, maybe we'll be able to overcome this, but not right now. I trusted you, and you took advantage of that. I don't want to divorce you. If you want to keep this marriage, though, we are both going to have to work at it. On your part, that means being faithful and never sleeping with her again. The only way I can trust you again is if I am your only girl."

Olivia nodded silently. "I can do that. I promise I won't ever get in bed with her again."

"And on my part," Casey continued, "that means proving to my heart that my love for you is stronger than my hurt. This is all going to take time, Olivia. I love you with everything I have, but for right now, I can't trust you. I can only hope that you understand. Put yourself in my shoes." She stood up.

"Are you going to move out?"

"Not even out of this bedroom. But it's going to take a lot to get back to where we were before."

Olivia was quiet for several moments before responding. Finally, she said "I'm sorry for everything."

Casey nodded. "I hope so," she replied. "I need to take a shower." For the first time ever, she closed the bathroom door, barring the detective from joining her.